How To Reset a Worcester Bosch Boiler

If you’ve just discovered an error code on your trusty Worcester Bosch boiler that’s not going away (even if the issue has been addressed), you will want to reset it.

With Worcester Bosch boilers, several error codes will indicate it has shut down or initiated lockout mode.

Some of these codes include:

• EA: No flame detected could indicate a gas supply issue or ignition failure.
• E9: Overheating or pump issue
• E5: Fan speed fault or an airflow issue
• E1 10: Low water pressure, usually kicking in when below 0.5 bar
• E1 218: Ignition lockout
• C6: Fan speed issue
• D1: Sensor or wiring fault
• A1: Pump failure or circulation fault
• F0 238: Gas valve failure
• F7 Flame detected when boiler should be off
• 2920: Flame signal is lost during operation

These error codes can differ depending on your boiler’s model and year, so it is always best to check the unit’s manual for the meaning.

To reset your Worcester Bosch boiler, it needs to be in an error state.

Resetting a boiler is usually a straightforward task, but there are some general steps you can follow to ensure you’re doing it correctly.

Performing A Reset Of A Worcester Bosch Boiler

For Worcester Bosch’s 1000, 2000, 4000, and 8000 models, you will want to follow the steps below.

However, it’s straightforward for homeowners with a CDI Compact: Just hold down the reset button on the front of the unit.

But for the other Worcester Bosch boiler models, these are the steps to follow:

Step One: Error Code

Before you reset your Worcester Bosch boiler, make sure to take a note of the error code. You can do this by snapping a photo or jotting down a note in your boiler’s manual.

Missing this step won’t affect the reset process; it is just in case the issue reoccurs, or you need to contact a Gas Safe registered engineer.

Step Two: Holding Down The Buttons

Next to your Worcester Bosch boiler’s display, you’ll find up and down arrows. Hold down these buttons together simultaneously for three to five seconds.

Most Worcester Bosch boilers will display a short message indicating that they are resetting.

Step Three: Waiting And Watching

If everything has gone perfectly, reigniting the boiler will take a minute or two.

After the boiler has returned to its usual state, check that the hot water and heating systems are working correctly.

However, if this has not removed the error code and it has reappeared, you can consider doing a more manual reset.

Step Four: Turn Off The Power

While this additional step won’t be in the manual, you might need to turn off your boiler at its power source.

Close to your boiler should be a fuse spur. If you’re uncertain what a fuse spur is, it’s a square white box with a large switch in the middle.

Flip this switch on and off. You should allow a few seconds for the boiler to shut down.

Sometimes, a boiler is simply plugged into a socket, which will just require you to flip the switch.

If you cannot locate your boiler’s plug point, try switching it off and on at the distribution board, also known as:

• Panelboard
• Circuit breaker panel
• Breaker panel
• Electric panel,
• Fuse box,
• Or DB board/box.

Once you’ve turned the power back on, your Worcester Bosch boiler should be reset successfully.

But if you still get the same error message, you will want to do some more troubleshooting.

Further Troubleshooting If Your Boiler Fails To Reset

As with everything in life, the simplest tasks can become more complicated. If your boiler is refusing to reset, you will want to do a few quick checks:

Identify The Error Code

As mentioned, to reset your Worcester Bosch boiler, it needs to be in an error state. Make sure to double-check what the error code means.

Usually, the manufacturer will include a comprehensive list of error codes in their manual.

If you’ve lost your manual or are struggling to find a solid answer, you can do some simple checks before calling in a professional.

Check The Gas Supply

A simple check is to see if your home’s main gas supply valve is fully open. Your home’s gas mains should be fully open.

Another way to check for a gas supply issue in your home is to turn on other gas appliances, such as a kitchen stove.

If you suspect a gas supply issue, contact your gas provider. There might be a local supply issue in your area.

However, if you smell gas, turn off the supply immediately and call for help.

Check Water Pressure

Most Worcester Bosch boilers have a pressure gauge on the front panel. The ideal reading is between 1.0 and 1.5 bar when the system is cold.

If the water pressure reading is below 1.0 bar, your boiler might need to be repressurised.

On the other side of the scale, if your Worcester Bosch boiler’s reading is too high, above 2.5 bar, you will want to bleed a radiator in your home to lower the pressure.

Check The Power Supply

It could be an electrical issue if your boiler has not turned back on after the reset.

Ensure the boiler is plugged into a working power socket and no circuit breakers have tripped.

For those who turned off their boiler via the fuse spur switch, a fuse could have blown if flipping the switch had not resulted in power feeding to the boiler.

While most of these checks can be completed relatively quickly, if you’re struggling to reset your boiler, we highly recommend calling an expert for help.

Call WarmZilla’s Professionals For A Chat

Rather than struggling with trying to reset your Worcester Bosch boiler, you can call one of our professionals to talk you through troubleshooting the problem.

However, suppose you both discover a more substantial issue. In that case, the professional on the phone will suggest sending a Gas Safe registered engineer to your home within 48 hours to reset your boiler.